<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>清除某些HTML元素的默认样式</title>
    <style type="text/css">
        body, p, ul, ol, dl, dt{
            margin: 0px;
            padding: 0px;
        }
        ul, ol{
            list-style: none;
        }
        input{
            border: none;
            outline: none;
        }
    </style>
</head>
<body>
    <p>段落</p>
    <p>段落</p>
    <ul>
        <li>谭金林</li>
    </ul>
    <input type="text">
</body>
</html>